Respostas

2013-10-10T15:37:51-03:00
12a²+9a/3a =  a(12a+9)/3a =  12a+9/3  3(4a+3)/3 =4a+3
1 5 1
2013-10-10T15:39:59-03:00
 \frac{12 a^{9}+9a }{3a} 

COLOCA EM EVIDENCIA
 \frac{3a(4a+3)}{3a} 

AGORA VOCE CORTA O 3A
4a+3
3 4 3